The following fan theories are about space-time manipulation.
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|There is some kind of higher-power/cosmic authority that prevents Hiro from creating paradoxes.|| When Hiro seems on the verge of saving Charlie and thus causing a causality paradox, he returns unexpectedly to the present. (Six Months Ago)
In the novel Saving Charlie, Hiro makes several attempts over a six month period (though much longer for him) to try and put Charlie out of harm's way. These attempts, along with his first few attempts at intimacy with Charlie, result in Hiro teleporting someplace else relevant to his "destined" mission (i.e. saving Claire), such as the morgue where James Walker's body is being stored.
| + Hiro's forced return to present-day Japan and inability to use his powers to go back and make further attempts to save Charlie Andrews suggest that something is blocking his ability to go back to that specific point in space.|
+ Also, Future Hiro has to get someone else to go back to present-day Odessa to save Claire rather than taking matters into his own hands, perhaps due to his inability to return to that point in space and time due to a rift his past self created.
- Hiro eventually did save Charlie's life (Once Upon a Time in Texas).
|There is no predestination in the world of Heroes.||Hiro's trip to the past appears to have actually changed past events from his perspective. (Six Months Ago)|| + If Hiro's trip to the past to try and save Charlie were meant to have happened, then all of his former co-workers at the diner (to say nothing of Charlie herself) should have recognized Hiro when he came into the diner for the first time, six months after he had been working there.|
+ From a writing stand-point, it doesn't make sense for Hiro and Isaac to have the powers that they do if they cannot use those powers to change future events.
|A person with the power of space-time manipulation cannot have their memories altered by a change in their own personal timeline. In short, they are immune to the effects of a paradox changing time and if a person changes the past, their own memories of what things were like before the change will remain unaltered. The one exception to this is if they die in another time.|| Future Hiro traveled back to talk to Peter to tell him what to do to save Claire. (Hiros)
He must have figured that Peter, who could copy his power, would remain immune to the affects of any paradox Future Hiro caused by going back in time to deliver the warning. Hiro's memories of what the explosion future was like before he went to talk to Peter remained unchanged, though some details about the past did change. (Five Years Gone)
| + This would explain why Future Hiro needed to find an exact point to talk to Peter, before they "met for the first time" in the Dark Future.|
+ It would also explain why he chose Peter - who he knew would gain his power and become similarly immune to the effects of paradox.
|Future Hiro could only change the timeline by warning his past self.||Since a traveler from the future cannot change the past in a way that would prevent him going to the past to change it, Hiro found it necessary to imbue one in the present with the knowledge that could change that.|| + Hiro is at least somewhat free of normal space/time continuum rules. But not completely. By learning of the future and then going back to his original time, Hiro retained free will and can now actively work to change to future.|
+ This helps with the "rift" problem that Hiro alluded to with Peter. By traveling to Peter and Hiro exclusively, beings who possessed his power and by extension his immunity to the "rules", he was able to change the future and quite possibly, eradicate his existence. Because the past Hiro knew of the future, the knowledge remained in place even without the Future Hiro having to necessarily exist.
|Theoretically, if Hiro can bend space and time, he could make himself look younger, physically become younger and make himself invisible.||None|| - Bodily aging is caused by physical degradation of the body over time, not time itself.|
+ If the user had full control over his power, he or she could reverse time on their bodies (making themselves physically younger), whilst keeping it still on their minds, to retain their memories and identity.
|Space-time manipulation is actually the power to manipulate dimensions around oneself.||None|| + Time and space are both dimensions, the first three being space, and the fourth being time.|
+ Noah Bennet said that all the evolved humans with whom the Company has come in contact have only had one power each.
|If Hiro actually rewound time rather than teleporting, he would be able to change the past.||None|| + When Charlie was killed, if Hiro rewound the time, he would be there to prevent it.|
+ It appears that Hiro can rewind time around localized objects such as a clock or a bullet fired at him.
|Since this ability allows user to bend space, they can perform flight.||None|| • A space-time manipulator can possibly move from one location to another without teleporting, but rather moving themselves all the way.|
+ In season one, Hiro moved a bullet back through time by itself, not teleported. It stands to reason that something can be moved through space by the same ability
|Hiro can control the speed and direction at the destination of whatever he teleports.||None|| + Hiro teleports directly from Tokyo to New York City. The speed of the ground in New York City would be roughly 55 miles per hour faster relative to Tokyo, but Hiro emerges stationary.|
|Hiro becomes frozen in time, because he (unwillingly) accelerates it very much.||It was confirmed that when Hiro freezes time, it doesn't really stop, Hiro just slows it to a near halt.|| + Logically, by accelerating time, Hiro would become very slow and effectively freeze.|
• If Hiro accelerates time for himself to the point where the entire world appears to be frozen, it's possible that he could do the opposite; slow down time for himself until he appears to be frozen to the rest of the world.
|Travel through time eventually causes a fatal brain tumor.||Arnold died of a tumor and Hiro has been diagnosed with one.|| • Samuel states that "his [Arnold's] body couldn't take the strain". (Once Upon a Time in Texas)|
- Hiro got the tumor before he could time travel again.
• Neither Arthur Petrelli nor Peter Petrelli showed signs of a tumor, and Future Hiro seemed perfectly healthy. This could be because neither Arthur nor Peter used time traveling as extensively as Hiro.
|"Freezing" time doesn't stop time for the entire world, but speeds time up for the user until the point where they're moving so fast the entire world appears to have stopped around them.||None|| + It would take an absurd amount of power to stop time for the entire earth, but it wouldn't take nearly as much to speed time up for the user, which would essentially achieve the same effect.|
+ Daphne could move when Hiro froze time. She suggested Hiro only slows it, and it was confirmed by BTE.
+ In a blog post Hiro (when explaining why in Godsend he appeared to be only slowing down time as opposed to stopping it) says, "Instead of Stop, I casted Haste". The term "Haste" implies that time was accelerated, not slowed down.
|If a person possesses both space-time manipulation and telekinesis, they'd be able to teleport other people without physical contact.||None|| + With telekinesis, one can have a grasp over people and objects without physical contact.|
- Ability wouldn't extend if its holder doesn't touch another person.
|Space-time manipulation makes the user immune to the laws of time and space.||None|| + It is impossible for a person to exist in the same timeline as their future or past self, yet both Peter and Hiro have existed with their future selves in the same timeline. Without space-time manipulation, if someone were to somehow travel through time, the version of them from that timeline and all of their decendants up to that point would disappear because they would then exist at that timeline instead of their original timeline.|
|See Also: 9 • Red • Time travel • Space-time manipulation|